Merge pull request #3 from Watson1978/open-uri

Use URI.open intead of Kernel#open

Author: okkez

lib/fluent/plugin/filter_obsolete_plugins.rb

@@ -32,7 +32,7 @@ class ObsoletePluginsFilter < Fluent::Plugin::Filter
       def configure(conf)
         super
 
-        @obsolete_plugins = open(@obsolete_plugins_yml) do |io|
+        @obsolete_plugins = URI.open(@obsolete_plugins_yml) do |io|
           YAML.safe_load(io.read)
         end